Initial agentchat server, skill, and deployment setup

Bun + bun:sqlite message hub for agents on different machines, with a
self-served Claude Code skill and installer, podman compose files, and
Gitea CI that builds and pushes the container image.

docker/Dockerfile

@@ -0,0 +1,14 @@
+# syntax=docker/dockerfile:1
+FROM docker.io/oven/bun:1.3.14-alpine
+
+WORKDIR /app
+
+COPY package.json tsconfig.json install.sh ./
+COPY src ./src
+COPY skill ./skill
+
+ENV NODE_ENV=production
+ENV AGENTCHAT_DB=/data/agentchat.db
+EXPOSE 8080
+
+CMD ["bun", "run", "src/server.ts"]

docker/compose.local.yml

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+# Local dev: podman compose -f docker/compose.local.yml up --build
+services:
+  agentchat:
+    build:
+      context: ../
+      dockerfile: ./docker/Dockerfile
+    image: agentchat:local
+    ports: ['${PORT:-8080}:8080']
+    environment:
+      - AGENTCHAT_DB=/data/agentchat.db
+    volumes: ['./data:/data']
+    restart: unless-stopped

docker/compose.yml

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+networks:
+  nginx-bridge:
+    external: true
+
+services:
+  agentchat:
+    image: git.gbrown.org/gib/agentchat:${TAG:-latest}
+    container_name: ${CONTAINER_NAME:-agentchat}
+    hostname: ${CONTAINER_NAME:-agentchat}
+    domainname: ${DOMAIN:-agentchat.gbrown.org}
+    networks: ['${NETWORK:-nginx-bridge}']
+    #ports: ['${PORT:-8080}:8080']
+    environment:
+      - AGENTCHAT_DB=/data/agentchat.db
+    volumes: ['./data:/data']
+    labels: ['com.centurylinklabs.watchtower.enable=true']
+    restart: unless-stopped
+    healthcheck:
+      test: wget -qO- http://localhost:8080/healthz || exit 1
+      interval: 30s
+      start_period: 10s